Implement Ability to await Bindings

README.md

@@ -13,7 +13,7 @@ Better and more natural way of defining dependencies in .Net, LINDI is a languag
 - [ ] Binding Scopes
 - [ ] Automatic Factory Generation
 - [ ] Named Bindings
-- [ ] `await` keyword for resolving dependencies
+- [x] `await` keyword for resolving dependencies
 
 ## Issues
 Submit new issues as needed, reuse non-closed issues if possible.

src/LINDI.Core/IBinding.cs

@@ -1,4 +1,5 @@
 using JetBrains.Annotations;
+using System.Runtime.CompilerServices;
 using Lindi.Core.Bindings;
 
 namespace Lindi.Core

src/LINDI.Core/LINDI.Core.csproj

@@ -9,7 +9,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>Lindi.Core</RootNamespace>
     <AssemblyName>Lindi.Core</AssemblyName>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
   </PropertyGroup>
@@ -21,6 +21,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <Prefer32Bit>false</Prefer32Bit>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -29,6 +30,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <Prefer32Bit>false</Prefer32Bit>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Fasterflect, Version=2.1.3.0, Culture=neutral, PublicKeyToken=38d18473284c1ca7, processorArchitecture=MSIL">

src/LINDI.Core/Linq/BindingExtensions.cs

@@ -2,6 +2,8 @@
 using System.Collections.Generic;
 using System.Linq.Expressions;
 using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Threading.Tasks;
 using JetBrains.Annotations;
 using Lindi.Core.Bindings;
 
@@ -55,5 +57,15 @@ public static IBinding<T> GroupBy<T>(this IBinding<T> t, Func<T, bool> e)
         {
             return null;
         }
+
+        /// <summary>
+        /// Gets an awaiter used to await the resolution of this binding.
+        /// </summary>
+        /// <returns></returns>
+        public static TaskAwaiter<T> GetAwaiter<T>([NotNull] this IBinding<T> binding)
+        {
+            if (binding == null) throw new ArgumentNullException(nameof(binding));
+            return Task.FromResult(binding.Resolve()).GetAwaiter();
+        }
     }
 }

src/LINDI.Tests/AwaitableBindingTests.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Lindi.Core;
+using Lindi.Core.Linq;
+using Xunit;
+using Xunit.Abstractions;
+using static Lindi.Core.LindiMethods;
+
+namespace Lindi.Tests
+{
+    public class AwaitableBindingTests
+    {
+
+        [Fact]
+        public async void Test_Binding_Is_Awaitable()
+        {
+            var binding = from value in Bind<ISample>()
+                          select new Sample();
+
+            var v = await binding;
+
+            Assert.NotNull(v);
+            Assert.IsType<Sample>(v);
+        }
+
+        [Fact]
+        public async void Test_Get_Awaiter_On_Null_Binding_Throws_ArgumentNullException()
+        {
+            IBinding<ISample> binding = null;
+
+            await Assert.ThrowsAsync<ArgumentNullException>(async () =>
+            {
+                var v = await binding;
+            });
+        }
+    }
+}

src/LINDI.Tests/LINDI.Tests.csproj

@@ -59,6 +59,7 @@
     </Reference>
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="AwaitableBindingTests.cs" />
     <Compile Include="BindToConstructorTests.cs" />
     <Compile Include="ConceptTests.cs" />
     <Compile Include="HasSample.cs" />